Microhardness

microhardness

[¦mī·krō′härd·nəs] (metallurgy) Hardness of microscopic areas of a metal or alloy.

Microhardness

the hardness of individual segments of the microstructure of a material.

The microhardness is measured by pressing with a diamond pyramid under a load of less than 2 newtons (200 grams-force). The size of the mark produced is measured under a microscope, and the hardness number—the ratio of the applied pressure to the surface area of the mark—is calculated using special tables. The instrument for determining microhardness permits selection of a particular segment of the microstructure onto which the diamond will be pressed. Such selection, as well as the small size of the marks produced, makes possible measurement of the microhardness of crystals of individual phases or various segments of a grain.

Data on microhardness are used in studying plastic deformations and the nonuniformity of distribution of dissolved impurities along the grain, as well as for plotting phase equilibrium diagrams.

单词	microhardness
释义	Microhardness microhardness [¦mī·krō′härd·nəs] (metallurgy) Hardness of microscopic areas of a metal or alloy. Microhardness the hardness of individual segments of the microstructure of a material. The microhardness is measured by pressing with a diamond pyramid under a load of less than 2 newtons (200 grams-force). The size of the mark produced is measured under a microscope, and the hardness number—the ratio of the applied pressure to the surface area of the mark—is calculated using special tables. The instrument for determining microhardness permits selection of a particular segment of the microstructure onto which the diamond will be pressed. Such selection, as well as the small size of the marks produced, makes possible measurement of the microhardness of crystals of individual phases or various segments of a grain. Data on microhardness are used in studying plastic deformations and the nonuniformity of distribution of dissolved impurities along the grain, as well as for plotting phase equilibrium diagrams.
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